Polarization-resolved pump-probe spectroscopy with high harmonics

被引：32

作者：

Mairesse, Y. ^{[1
]}

Haessler, S. ^{[2
]}

Fabre, B. ^{[1
]}

Higuet, J. ^{[1
]}

Boutu, W. ^{[2
]}

Breger, P. ^{[2
]}

Constant, E. ^{[1
]}

Descamps, D. ^{[1
]}

Mevel, E. ^{[1
]}

Petit, S. ^{[1
]}

Salieres, P. ^{[2
]}

机构：

[1] Univ Bordeaux 1, CNRS, CELIA, UMR 5107,CEA, F-33405 Talence, France

[2] CEA Saclay, DSM, Serv Photons Atomes & Mol, F-91191 Gif Sur Yvette, France

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

关键词：

D O I：

10.1088/1367-2630/10/2/025028

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High harmonic generation in gases can be used as a probe of the electronic structure of the emitting medium, with attosecond temporal resolution and angstrom spatial resolution. The prospect of measuring molecular dynamics by pump-probe spectroscopy with such precision is attracting a lot of interest. An important issue in pump-probe spectroscopy lies in the ability to detect small signals: the detected signal can be easily dominated by the contributions from non-excited molecules or from a carrier gas. In this paper, we demonstrate that polarization-resolved pump-probe spectroscopy can be used to overcome this issue. We study high harmonic generation from rotationally excited molecules. We show that by measuring the harmonic field that is generated orthogonally to the driving laser field, the contrast in the detection of alignment revivals in nitrogen can be increased by a factor 4. We use this configuration to measure alignment revivals in an argon-nitrogen mixture, in which the total harmonic signal is dominated by the contributions from argon.

引用

页数：11

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